This PR switches the steps updating PR description to a local Javascript
script, run using `actions/github-script`, instead of depending on an
external third-party action.
Why? Besides reducing our dependency on third-party actions, which have
been found to break with surprises, we need this to fix a bug with the
`/test` command. The `/test` command, when is written with invalid tags,
reports the error in the workflow run, but doesn't update the PR
description. Because of how it's written in Javascript, we need a
Javascript way to update the description to fix that. This will provide
for that.
Further PRs will replace other uses of PR description update steps with
this.
**/test sanity**
<!-- This is an auto-generated comment: Cypress test results -->
> [!TIP]
> 🟢🟢🟢 All cypress tests have passed! 🎉🎉🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/9556890596>
> Commit: 00d06858f6f7d14c6393cb16c894ddfd808b7cf8
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=9556890596&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Sanity`
<!-- end of auto-generated comment: Cypress test results -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Chores**
- Updated GitHub Actions workflow to enhance pull request automation
with Cypress test results.
- Improved PR body updates with detailed test outcomes.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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